Seoul: A suspect in the hacking attacks on South Korean nuclear reactors used multiple IP addresses based in China, investigators said Wednesday.

The suspected hacker accessed the information from a Chinese city, a joint investigation of government and prosecution officials said, without disclosing the name of the city, Yonhap News Agency reported.

The suspect, the self-proclaimed president of an anti-nuclear activist group, has published a wide range of information since last week, including personal information of some 10,000 employees of the state-run nuclear power plants operator, the Korea Hydro & Nuclear Power (KHNP) company.

On Tuesday, the suspect posted more information on Twitter, including four files of reactor-related information and what appeared to be blueprints of facilities, safety analysis reports of the reactors and links to news on reactor technology.

The KHNP said the information, as in previous postings, only included general, unclassified blueprints.

It was the fifth leak of information on the Gori and Wolsong nuclear power plants, located 400 km south of Seoul.

The team said it had officially requested assistance from the Federal Bureau of Investigation (FBI) to look into the Twitter account, which is based in the US.